GM LS Flat Top Our brand new Asymmetrical FSR (Forged Side Relief) forging design allows for the use of the mostpopular stroke and rod combinations while eliminatingreluctor wheel clearance problems. Asymmetrical forgingdesign maintains a larger skirt on the heavily stressed major thrust side, while reducing friction with a smaller skirt on the minor thrust side. The result is a high strength, lightweight piston that significantly reduces friction in your engine. Lightweight and extremely durable, these pistons are machined for 1.2mm, 1.5mm, 3.0mm rings.

Includes:

• .927 x 2.250 straight wall carbon steel wrist pin
• Wire locks

Specifications:

• Part #: J311979
• Bore: 4.030"
• Oversize: .030"LS2
• Stroke: 4.000
• Rod Length: 6.125"
• Compression Height: 1.115"
• Compression Ratio with 64cc chamber volume: 11.7
• Compression Ratiowith 68cc chamber volume: 11.2
• Compression Ratiowith 70cc chamber volume: 11.0
• Dome Volume: -5cc
• Gram Weight:
• Footnote: Forged Side Relief
• Reconmended Ring Set: JG31F8-4030-2

Withover 60 years of experience, JE Pistons is the leader in high performance forged pistons. We've built a reputation that the competition can only follow. JE has a history of manufacturing the highest quality pistons and componentsthat professional engine builders, race teams, and highperformance enthusiasts trust and rely on.

The top engine builders in NASCAR, ALMS, NHRA, AMA Supercross andothers choose JE Pistons over any other brand. For over 60 years, JE's position at the forefront of performance piston manufacturing has been a result of continuous research and development of unique materials, piston designs and technologies. Utilising State-Of-The-Art CNCmachines for manufacturing along with purpose-designed forgings, JE is able to maintain exacting specifications on each and every piston and hold tolerances to millionths of aninch. Also available from JE is industry-leading processes like Ultra Crown, a Digital Three Dimensional piston crownmachining process and Finite Element Analysis (FEA). FEA isa computer processwhereby stress and fatigue are tested on a computer model before it goes into production. JE is the only performance piston manufacturer to earn the QS-9000 quality standard whichconfirms that JE provides customers the highest standards in quality control. In addition, we also have State-Of-The-Art inspection equipment and testing equipment which enables us to constantly bring you, the customer, the very latest in piston design configurations.